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        <a href="/2020/12/21/docker-k8s/" target="_self">
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      <h1 class="index-header">
        
        <a href="/2020/12/21/docker-k8s/">docker-k8s理论</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/12/21/docker-k8s/">
          
          
            
          
          Kubernetes(k8s)
是一个基于docker对容器进行编排的引擎，包括了安装部署，应用管理，网络，存储监控，日志管理等多个方面
k8s的核心功能：应用部署，访问 scale up/down(伸缩) 以及滚动更新

概念
这几个组成k8s

Cluster

Cluster（集群）是计算，存储和网络资源的集合，kubernetes利用这些资源运行各种基于容器的应用
Cluster可以只有一
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      <h1 class="index-header">
        
        <a href="/2020/12/21/docker-k8s%E5%88%9B%E5%BB%BA%E5%89%AF%E6%9C%AC/">docker-k8s-创建副本</a>
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        <a href="/2020/12/21/docker-k8s%E5%88%9B%E5%BB%BA%E5%89%AF%E6%9C%AC/">
          
          
            
          
          通过命令创建（以后版本取消）[root@node1 ~]# kubectl run httpd-app --image=httpd --replicas=2
Flag --replicas has been deprecated, has no effect and will be removed in the future.
pod/httpd-app created
# 提示以后的版本会删除此
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        <a href="/2020/12/17/docker-swarm/" target="_self">
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        <a href="/2020/12/17/docker-swarm/">docker-swarm集群</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/12/17/docker-swarm/">
          
          
            
          
          集群
从主机层面来看 docker Swarm管理的是 docker_host集群 这个是一个重要概念 集群化（Clustring）

集群是由一组互相连接的服务器组成，各个服务协同工作

集群和多服务的区别:

集群能像单个系统那样工作，同时提供负载均衡-高可用等功能


使用集群部署应用时，只考虑需要多少内存和CPU，而不是考虑会使用哪台的CPU和内存。我们不应该关心应用会被部署在哪里，我们关
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        <a href="/2020/12/15/docker-ELK%E6%97%A5%E5%BF%97%E9%87%87%E9%9B%86/" target="_self">
          <img src="/images/docker/docker_logo.jpg" srcset="/img/loading.gif" alt="docker-ELK日志采集">
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      <h1 class="index-header">
        
        <a href="/2020/12/15/docker-ELK%E6%97%A5%E5%BF%97%E9%87%87%E9%9B%86/">docker-ELK日志采集</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/12/15/docker-ELK%E6%97%A5%E5%BF%97%E9%87%87%E9%9B%86/">
          
          
            
          
          ELK日志采集
Elasticsearch：近乎全文搜索引擎
Logstash：读取原始日志进行过滤和分析
Kibana：web图形页面




192.168.100.211




下载elk

 [root@localhost ~]# docker pull sebp/elk:760


修改参数

 主机内存 最少4g
[root@localhost ~]# echo &#x27;vm.m
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              2020-12-15
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        <a href="/2020/12/15/docker-%E6%97%A5%E5%BF%97%E7%AE%A1%E7%90%86/" target="_self">
          <img src="/images/docker/docker_logo.jpg" srcset="/img/loading.gif" alt="docker-日志管理">
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      <h1 class="index-header">
        
        <a href="/2020/12/15/docker-%E6%97%A5%E5%BF%97%E7%AE%A1%E7%90%86/">docker-日志管理</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/12/15/docker-%E6%97%A5%E5%BF%97%E7%AE%A1%E7%90%86/">
          
          
            
          
          docker 日志处理
日志管理：logging driver
日志驱动：json-file 
通过 docker info 查看上面这俩个东西

docker默认自带日志功能
对于一个运行的容器，docker会将日志发送到容器标准的输入输出设备
[root@localhost ~]# ll /dev/stdout
lrwxrwxrwx. 1 root root 15 12月 16 21:47 /
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        <a href="/2020/12/15/docker-%E7%9B%91%E6%8E%A7/" target="_self">
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        <a href="/2020/12/15/docker-%E7%9B%91%E6%8E%A7/">docker-监控</a>
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        <a href="/2020/12/15/docker-%E7%9B%91%E6%8E%A7/">
          
          
            
          
          监控
sysdig cadvisor promethus，这些都是第三方监控软件
原生监控
docker ps 

 # 查看docker web1的信息
 [root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS    
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        <a href="/2020/12/14/docker-weave/" target="_self">
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      <h1 class="index-header">
        
        <a href="/2020/12/14/docker-weave/">docker-weave网络</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/12/14/docker-weave/">
          
          
            
          
          weave
weave网络属于第三方网络
weave在docker主机之间实现的是overlay网络，使用vxlan封装，基于udp传输，也可以加密传输
weave网络再开启时，会创建一个连接多个docker主机的虚拟网络，类似于以太网交换机，所有容器都连接在上面，互相通信

weave网络转发原理

在创建weave网络时，会在本机自动创建一个虚拟空间，这个空间里面有一个，datapath网卡功
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              2020-12-14
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        <a href="/2020/12/11/docker-flannel%E7%BD%91%E7%BB%9C/" target="_self">
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        <a href="/2020/12/11/docker-flannel%E7%BD%91%E7%BB%9C/">docker-flannel</a>
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      <p class="index-excerpt">
        <a href="/2020/12/11/docker-flannel%E7%BD%91%E7%BB%9C/">
          
          
            
          
          flannel
flannel 为每个主机分配一个(subnet)子网，容器从这个子网中分配ip ，这些ip可以在主机之间进行路由
每个容器之间不需要nat和端口映射，就能完成跨主机通讯
通过计算机的最长匹配原则来进行的

flannel数据转发
数据会通过 backend来从etcd进行转发
数据包如何在主机间转发是由 backend 实现的。flannel 提供了多种 backend，最常用的
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              2020-12-11
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        <a href="/2020/12/10/docker-overylay%E7%BD%91%E7%BB%9C/">
          
          
            
          
          overlay网络转发原理  

创建好docker-overlay类型的容器后，docker会创建一个命名空间，里面会有一个br0网卡
而这个命名空间内veth0桥接着br0,它的作用是和容器的eth0进行veth pair连接通信，
这个命名空间内还有一个vxlan0网卡,它的作用是进行跨主机通信，只要两端的 命名空间内的 vxlan_id相同就可以通信
要相同的 id才能通信，那么就需要co
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              2020-12-10
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        <a href="/2020/12/09/docker-machine/">docker-machine</a>
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      <p class="index-excerpt">
        <a href="/2020/12/09/docker-machine/">
          
          
            
          
          docker-machine
是一个简化docker安装的命令行工具。可以让主机一瞬间安装很多容器，并且可以远程进行管理

安装
https://docs.docker.com/search/?q=machine 可以查看怎样安装

复制官网的命令下载完即可完成安装

[root@bogon ~]# base=https://github.com/docker/machine/releases/d
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